[mesa-users] Results changing while rerunning the same problem

[Bill Paxton]

Hi,

Please DO NOT run another 12000 step run before checking to see if the results are changing.
Start over with 2 runs in separate directories and run each for minimal number of steps to show a difference.

-B




On Jan 15, 2013, at 4:36 PM, trobolo dinni wrote:

> Hi Bill,
> 
> Exactly, I did two runs with exactly the same inlist: after I finished the first simulation I checked the results, then I ./rn in the same directory without touching anything.
> 
> I didn't check at what model number the simulations begin to differ, but for sure in the first one the "power_he_burn_upper_limit" reaches 1d4 at model number 15295, while in the second at model number 12835, and at that time all the physical variables of the two stars are different.
> Unfortunately since I did the simulation in the same directory of the previous I have lost the logfiles of the first one and I can't go back to check. Anyway I am now running a third one.
> 
> After this third try I am going to change to OMP_NUM_THREADS 1.
> 
> I hope I have been clearer, sorry and thanks, 
>                                                                    Roberto
> 
> 
> 
> 2013/1/16 Bill Paxton <paxton at kitp.ucsb.edu>
> Hi,
> 
> I still don't understand.   You do two runs with the same inlist.  At what model number do the results first differ?  model 1?  model 10000?
> 
> Can you repeat this?  Or does it happen randomly?
> 
> Does it still happen when you set OMP_NUM_THREADS 1
> 
> -B
> 
> 
> 
> On Jan 15, 2013, at 4:03 PM, trobolo dinni wrote:
> 
>> Hi Bill,
>> 
>> I attached the namelist I am using, I have not starting models since I rerun the same simulation from the beginning.
>> 
>> Starting from the model number reached at the end of the simulation (15295 the first time and 12835 the second), every physical variable of the star I was simulating was different.
>> I am stopping the simulations at the He flash, using the criterion suggested me by Aaron Dotter in a previous discussion, which consists in setting up the "power_he_burn_upper_limit" control to 1d4 or so. Hence is like the star reaches the He flash at different moments in different simulations.
>> 
>> I am using mesasdk to compile mesa, it uses gfortran 4.7.2; I am running the code in 64 bit linux (Ubuntu 12.04.1 LTS) box; the mesa version is the 4740.
>> 
>> Sorry for the lack of information in my first email!
>> Thanks for the help,
>>                                 Roberto
>> 
>> 
>> 2013/1/16 Bill Paxton <paxton at kitp.ucsb.edu>
>> Hi,
>> 
>> Please provide the necessary info for us to try to reproduce the problem.
>> That means inlists and starting model if any.
>> And exact details about what you notice as different.
>> Also, what compiler and what system and what version of mesa.
>> 
>> -B
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> On Jan 15, 2013, at 3:36 PM, trobolo dinni wrote:
>> 
>> > Dear MESA users,
>> >
>> > I have got a simple weird problem: I run the same simulation twice, and I am getting two different results.
>> >
>> > I know it does not depends on the code, but I would like to ask if anyone noticed the same behavior and if it can depend on my computer or if I have to do something particular before running again the same simulation in the same directory.
>> >
>> >
>> > Thanks,
>> >                 Roberto
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>> 
>> <inlist.1M-preMS_RGBtip-sb_rot_0.3_from_ZAMS>
> 
> 

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